John Cairncross By Olena Kulakovska

Infamous spies in history

Clockwise from top left: Kim Philby, Anthony Blunt, Donald Maclean and Guy Burgess. The Cambridge Five were at the heart of one of the most infamous spying scandals in British history. They included fourth man and double agent Anthony Blunt, who helped recruit Guy Burgess and Donald Maclean, who defected to the USSR in 1951. Kim Philby turned to the Soviet Union in 1963. John Cairncross has been named as the fifth man. Picture: PA

The Shadow Man: At the Heart of the Cambridge Spy Circle

Clockwise from top left, Anthony Blunt, Donald Duart Maclean, Kim Philby and Guy Burgess. All were members of the so-called Cambridge Five, who passed information from British intelligence to the Soviet Union. Burgess and Maclean fled to Moscow in June.